Since we don't really know that "time" is, we most certainly could be wrong. As for time travel, we do that every day, with the current proviso that we only travel "forward" at a rate of 60 minutes to the hour.
kind of. thing is, if you were to time travel, travel to that same point in space. and because EVERYTHING is ALWAYS MOVING, even one second would make you lost in space forever. the only way to fix this is if a "anchor" were to be made, and when you traveled, you would wind up about the same proximity of that anchor. so time travel can only be done in the future.
Time is a measurement for relative space. By definition the concept of "time travel" is nonsensical. If you had the power to "time travel" you have the power to manipulate the cosmos on such a grand scale that "time travel" would be irrelevant. Reversing everything or accelerating processes is entirely possible but everything at once is a ridiculous concept even more unrealistic, by a long shot, than making a pizza the size of the sun.
We know there was a past because we are here. We know there is a present because we are in it. We are all waiting for the future. As for time travel : jesus was resurrected & He could pass out of a room without opening a door & he could disappear out of a dangerous crowd when He needed to. When we get our new resurrected spiritual body ............ The sky is the limit .... ???